Simon Willison • 4/22/2026

Quoting Bobby Holley

This article features Bobby Holley, CTO of Firefox, describing a collaboration with Anthropic to apply an early version of Claude Mythos Preview to Firefox. The resulting Firefox 150 release includes fixes for 271 vulnerabilities identified during the evaluation. Holley emphasizes the importance of reprioritizing tasks to focus on security, expressing optimism for defenders in the tech industry. The piece is tech-focused, discussing software security, vulnerability remediation, and AI-assisted development.

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#security #Firefox #Anthropic